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Example:

javascript
    define(['./moduleB'], function(moduleB) {
      return function() {
        console.log('Module A');
        moduleB();
      };
    });
    

3. Worldwide Module Definition (UMD)

UMD aims to be compatible with both CommonJS and AMD, providing a single module format that‍ works in various environments.It attempts to detect the module system and adapt accordingly.

4. ES Modules (ESM)

the official standard module system for JavaScript, introduced with ECMAScript 2015 (ES6). ‍It uses import and export ⁢ keywords. I've found that ESM is becoming increasingly prevalent as browser support ⁢improves.

Example:

javascript
    // moduleA.js
    import moduleB from './moduleB.js';
    export function doSomething() {
      console.log('Module A');
      moduleB();
    }

    // moduleB.js
    export default function() {
      console.log('Module B');
    };
    

While the module formats define how modules are structured, module loaders and bundlers ‍are the tools that implement them.

Webpack: A powerful bundler⁣ that can⁣ handle various module formats and perform optimizations like code splitting and minification.
Parcel: A zero-configuration bundler known for ‍its simplicity and speed.
Rollup: Specifically designed for bundling libraries, focusing on creating